Engine Component Description (1.4L LUH and LUJ)
Cylinder Block
The cylinder hollow frame structured in-line 4 cylinder. The
block has 5 crankshaft bearings with the thrust bearing located on
the third bearing from the front of the engine.
Crankshaft
The crankshaft is a steel crankshaft. It is supported in 5 main
journals with main bearings which have oil clearance for
lubrication. The 3rd bearing is the thrust bearing which controls
the proper axial end play of the crankshaft. A harmonic damper is
used to control torsional vibration.
Oil Pump
The engine is equipped with a variable oil pump. The oil pump is
integrated into the engine front cover and provides different oil
pressure values depending on the engine speed.
Oil Pan
The oil pan is a structural aluminum oil pan with transmission
attachment points. The oil suction gallery for the oil pump is
integrated into the oil pan.
Piston and Connecting Rod
The pistons are aluminum pistons. The connecting rods are made
of fractured steel. The piston pin is floating in piston bore and
shrinked in connecting rod.
Cylinder Head
This cylinder head is a double over head camshaft (DOHC) type
and has 2 camshafts that open 4 valves per cylinder with hydraulic
valve lash adjusters and hydraulic valve lash adjuster arms. The
cylinder head is made of cast aluminum alloy for better strength
and hardness while remaining light weight. The combustion chamber
of the cylinder head is designed for increasing of squish and swirl
efficiency to help maximize gasoline combustion efficiency.
Camshaft Drive with Variable Camshaft Timing
A timing chain is used for camshaft drive. There is a tensioner
to control the tension of the chain. The engine is equipped with a
variable camshaft timing system. The camshaft adjuster will
readjust itself depending on the engine speed. The valve timing
readjusts to reduce fuel consumption and provide optimal power and
torque.
Intake Manifold
The intake manifold provides the air flow passage to the
combustion chambers through the throttle body. The intake manifold
along with the throttle body have an effect on engine torque,
power, noise, drivability, emission, fuel economy and performance.
The intake manifold is made of plastic for better strength with
maintaining a light weight.
Turbocharger
The turbocharger consists of turbine and compressor on a common
shaft. The shaft bearing is constructed to higher rotation speed
and lubricated by engine oil. The turbocharger is water cooled for
improved durability. The turbine wheel is driven by exhaust
emissions. The compressor wheel compresses the intake air. A bypass
valve (Wastegate) regulates the charging pressure for generating a
high pressure at low speed as well. At a defined charging pressure
it regulates the way of the exhaust emission on bypassing the
turbine wheel. The Wastegate valve is controlled pneumatic and
electric from the pressure in the intake manifold. The pressure of
exhaust emission is reduced by opening the Wastegate thereby
reducing the intake pressure.
Positive Crankcase Ventilation
The crankcase ventilation system is used to consume crankcase
vapors in the combustion process instead of venting vapors to the
atmosphere. Fresh air from the intake system is supplied to the
crankcase, mixed with blow-by gases and then passed through a
calibrated orifice into the intake manifold. The primary control is
through the positive crankcase ventilation (PCV) orifice which
meters the flow at a rate depending on inlet vacuum. The PCV
orifice is an integral part of the camshaft cover. If abnormal
operating conditions occur, the system is designed to allow
excessive amounts of blow-by gases to back flow through the
crankcase vent into the intake system to be consumed by normal
combustion.
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